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fix: support constructing json from C++20 range views (#4916) (#5205)

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Federico Sfriso authored and GitHub committed 2026-07-11 09:13:04 +02:00
1 parent 6ba332c7df
commit c60217e801
4 files changed
+270 -8
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include/nlohmann/detail/conversions/to_json.hpp
+41 -3
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@@ -177,8 +177,11 @@ struct external_constructor<value_t::array>
}
template < typename BasicJsonType, typename CompatibleArrayType,
enable_if_t < !std::is_same<CompatibleArrayType, typename BasicJsonType::array_t>::value,
int > = 0 >
enable_if_t < !std::is_same<CompatibleArrayType, typename BasicJsonType::array_t>::value
#if JSON_HAS_RANGES && !defined(__MINGW32__)
&& !is_compatible_range_view<CompatibleArrayType>::value
#endif
, int > = 0 >
static void construct(BasicJsonType& j, const CompatibleArrayType& arr)
{
using std::begin;
@@ -218,6 +221,25 @@ struct external_constructor<value_t::array>
j.set_parents();
j.assert_invariant();
}
// std::ranges does not work properly on MinGW due to incomplete C++20 support
// see https://github.com/nlohmann/json/issues/4916
#if JSON_HAS_RANGES && !defined(__MINGW32__)
template<typename BasicJsonType, typename CompatibleArrayType,
enable_if_t<is_compatible_range_view<std::remove_cvref_t<CompatibleArrayType>>::value, int> = 0>
static void construct(BasicJsonType& j, CompatibleArrayType && arr)
{
j.m_data.m_value.destroy(j.m_data.m_type);
j.m_data.m_type = value_t::array;
j.m_data.m_value = value_t::array;
for (auto&& x : std::forward<CompatibleArrayType>(arr))
{
j.m_data.m_value.array->push_back(x);
j.set_parent(j.m_data.m_value.array->back());
}
j.assert_invariant();
}
#endif
};
template<>
@@ -355,13 +377,29 @@ template < typename BasicJsonType, typename CompatibleArrayType,
!is_compatible_object_type<BasicJsonType, CompatibleArrayType>::value&&
!is_compatible_string_type<BasicJsonType, CompatibleArrayType>::value&&
!std::is_same<typename BasicJsonType::binary_t, CompatibleArrayType>::value&&
!is_basic_json<CompatibleArrayType>::value,
!is_basic_json<CompatibleArrayType>::value
#if JSON_HAS_RANGES && !defined(__MINGW32__)
&& !is_compatible_range_view<CompatibleArrayType>::value
#endif
,
int > = 0 >
inline void to_json(BasicJsonType& j, const CompatibleArrayType& arr)
{
external_constructor<value_t::array>::construct(j, arr);
}
#if JSON_HAS_RANGES && !defined(__MINGW32__)
template < typename BasicJsonType, typename T,
enable_if_t < is_compatible_range_view<std::remove_cvref_t<T>>::value
&& !is_compatible_string_type<BasicJsonType, std::remove_cvref_t<T>>::value
&& !is_compatible_object_type<BasicJsonType, std::remove_cvref_t<T>>::value
&& !is_basic_json<std::remove_cvref_t<T>>::value, int > = 0 >
inline void to_json(BasicJsonType& j, T && arr)
{
external_constructor<value_t::array>::construct(j, std::forward<T>(arr));
}
#endif
template<typename BasicJsonType>
inline void to_json(BasicJsonType& j, const typename BasicJsonType::binary_t& bin)
{